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fix(es/module): Fix handling of continuous assignments in systemjs (#7741)

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**Description:**

Fix transpile the continuous assignment code like `d.a = d.b = d.c = d.d = ... = void 0;` to SystemJS may cause Infinite loop.

**Related issue:**

 - Closes #7143.
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thy486 2023-08-03 10:43:17 +08:00 committed by GitHub
parent 5afdd2ed54
commit f713f6aba8
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9
crates/swc_ecma_transforms_module/src/system_js.rs
View File

@ -562,6 +562,15 @@ impl Fold for SystemJs {
let assign_expr = AssignExpr {
right: match *assign.right {
Expr::Ident(ident) => Box::new(self.fold_module_name_ident(ident)),
Expr::Assign(AssignExpr {
op: AssignOp::Assign,
..
}) => {
return self.replace_assign_expr(AssignExpr {
right: assign.right,
..assign
});
}
_ => assign.right,
},
..assign

18
crates/swc_ecma_transforms_module/tests/system_js.rs
View File

@ -22,6 +22,24 @@ fn tr(_tester: &mut Tester<'_>, config: Config) -> impl Fold {
)
}
test!(
syntax(),
|tester| tr(tester, Default::default()),
allow_continuous_assignment,
r#"var e = {}; e.a = e.b = e.c = e.d = e.e = e.f = e.g = e.h = e.i = e.j = e.k = e.l = e.m = e.n = e.o = e.p = e.q = e.r = e.s = e.t = e.u = e.v = e.w = e.x = e.y = e.z = e.A = e.B = e.C = e.D = e.E = e.F = e.G = e.H = e.I = e.J = e.K = e.L = e.M = e.N = e.O = e.P = e.Q = e.R = e.S = void 0;"#,
r#"System.register([], function (_export, _context) {
"use strict";
var e;
return {
setters: [],
execute: function () {
e = {};
e.a = e.b = e.c = e.d = e.e = e.f = e.g = e.h = e.i = e.j = e.k = e.l = e.m = e.n = e.o = e.p = e.q = e.r = e.s = e.t = e.u = e.v = e.w = e.x = e.y = e.z = e.A = e.B = e.C = e.D = e.E = e.F = e.G = e.H = e.I = e.J = e.K = e.L = e.M = e.N = e.O = e.P = e.Q = e.R = e.S = void 0;
}
};
});"#
);
test!(
syntax(),
|tester| tr(